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Home Brew Forums > Home Brewing Beer > DIY Projects > Fermenters > Son of Fermentation Chiller - Electronics High Pitch Whine
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Old 04-25-2013, 09:04 PM   #1
Fresh95
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Default Son of Fermentation Chiller - Electronics High Pitch Whine

I recently build the Son of Fermentation Chiller and noticed that my fan seems to make a high pitched whine when it's not running. The components I've purchased are:

12 volt DC Computer Fan (Radio Shack model 273-243B)
Enercell AC Adapter 1.5 – 12 volt (Radio Shack model 273-315)
Honeywell Thermostat from Home Depot (Model # CT31A)

I've connected everything as the original Son of Fermentation Chiller guide recommended. Fan Negative (Blue) to Adapter Negative (Written Wire), Fan Positive (Red) to Thermostat G, and Adapter Positive (Blank Wire) to Thermostat R.

The circuit works exactly as intended. When the thermostat is set to On the fan runs continuously. When set to Auto the fan turns on when the ambient temperature is above the thermostat's setting. The Adapter is set to 12 volts and the thermostat is set to Cool.

Whenever the thermostat is set to auto and the temperature is below the thermostat's setting (Fan is not running) I hear a very high pitched whine or squeal coming from the circuit. I believe it's coming from the fan though I'm not entirely sure. This happens immediately when the adapter is plugged in and the thermostat is set to a very low temperature. When either I switch the thermostat to On then back to Auto, or when the thermostat is on Auto and I raise the temperature setting then lower it again, either way turning the fan On then Off again essentially, the whine takes about 1 second to build then settles into the familiar high pitched noise again. I heard nothing with the thermostat set to Off.

Does anyone have experience with these components, or circuits in general? Any ideas on what could be causing the whine? More importantly, is it anything to worry about? I'm cautious to utilize the electronics until I understand what's causing the noise. Any help is appreciated. Thank you.

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Old 06-29-2014, 05:44 PM   #2
Debvano
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Default Same Problem

I am having the exact problem with my set-up. Didn't see a response, and was wondering if anyone had advice/input?

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Old 06-29-2014, 08:31 PM   #3
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Disconnect the fan and then put your ear against the wall wart...and then the thermostat...

Cheers!

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Old 06-30-2014, 04:08 PM   #4
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Sometimes cheap switch-mode power supplies, which I'm assuming is what you have, make that noise when they're working.

Cheers,
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Don

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Old 06-30-2014, 05:39 PM   #5
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Hi idylldon, you mean even when the component isn't operating, just while power is flowing they'll whine? If so that's good to know.

An update for Deb, I never figured out why my setup produces this noise. In all my googling when I first constructed the chamber I only found one other person on another forum using the same components. I messaged him asking if his chamber was also producing the noise and he said yes but he'd never had any problems so he didn't worry about it. I've used mine now for over a year, never had a problem. I don't know if it's safe, just never had an issue. Hopefully idyll's response means it truly is nothing to worry about.

Thanks for reviving this thread, at least I know I didn't just mess up my connections, or if I did I'm not the only one.

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Old 06-30-2014, 06:14 PM   #6
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Quote:
Originally Posted by Fresh95 View Post
Hi idylldon, you mean even when the component isn't operating, just while power is flowing they'll whine? If so that's good to know.
Yes, some of them will whine a bit when current is flowing. Since it's only powering a small fan, it should have the capacity. Just make sure the fan doesn't draw more than the DC adapter is rated for.

Cheers,
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